Electronics Forum | Mon Dec 07 17:56:45 EST 1998 | Tom Braswell
I have been put incharge of developing a process to rework a doublesided SMT PCB with DCA/COB (direct chip attach, chip on board ) components. The rework will consist of removing some 603-1206 chips on both sides of PCB, oh yeah its has a polyuretha
Electronics Forum | Wed Sep 30 11:32:45 EDT 2009 | pbarton
What type of conformal coating are you using and are you allowing the coating to migrate under the device in question? If you are allowing the coating unbder the BGA the problem could be CTE of coating is much greater than that of the BGA balls/sold
Electronics Forum | Wed Sep 14 15:42:45 EDT 2011 | nowak18
During temperature cycling we have determined that the conformal coating wicking underneath our BGAs has caused fractures in our solder balls. One proposed solution is to run an RTV dam around the parameter of the BGA to prevent the CC from wicking u
Electronics Forum | Tue Jun 29 14:55:22 EDT 2010 | rgduval
For the capacitors that Yageo analyzed... Were they taken out at representative points in the process?? ie. were samples taken from pre-assembly, pre-ICT, post-conformal coat, post-final test? You note that the parts 'seem' to be ok up to ICT. And
Electronics Forum | Fri Sep 17 03:55:45 EDT 1999 | Brian
| We have some SMT components with gold plated leads. They're actually LCC led packages. A good solder alloy to use would be Indium / Lead to reduce tin dissolution into the gold and avoid the resultant brittle intermetallic compound. However, a reco
Electronics Forum | Fri Sep 17 06:01:12 EDT 1999 | Earl Moon
| | We have some SMT components with gold plated leads. They're actually LCC led packages. A good solder alloy to use would be Indium / Lead to reduce tin dissolution into the gold and avoid the resultant brittle intermetallic compound. However, a re
Electronics Forum | Fri Sep 17 15:01:05 EDT 1999 | Dave F
| | We have some SMT components with gold plated leads. They're actually LCC led packages. A good solder alloy to use would be Indium / Lead to reduce tin dissolution into the gold and avoid the resultant brittle intermetallic compound. However, a re
Electronics Forum | Fri Sep 17 09:54:40 EDT 1999 | Brian
| | | We have some SMT components with gold plated leads. They're actually LCC led packages. A good solder alloy to use would be Indium / Lead to reduce tin dissolution into the gold and avoid the resultant brittle intermetallic compound. However, a
Electronics Forum | Fri Sep 17 10:09:17 EDT 1999 | Earl Moon
| | | | We have some SMT components with gold plated leads. They're actually LCC led packages. A good solder alloy to use would be Indium / Lead to reduce tin dissolution into the gold and avoid the resultant brittle intermetallic compound. However,
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